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A007964 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1213
1314
1415
1517
1619
1721
1822
1923
2025
2126
2227
2329
2431
2533
2634
2735
2837
2938
3039
3141
3243
3346
3447
3549
3651
3753
3855
3957
4058
4159
4261
4362
4465
4567
4669
4771
4873
4974
5077
5179
5282
5383
5485
5586
5687
5789
5891
5993
6094
6195
6297
63101
64103
65106

[1,2,3,4,5,6,7,8,9,10,11,13,14,15,17,19,21,22,23,
 25,26,27,29,31,33,34,35,37,38,39,41,43,46,47,49,
 51,53,55,57,58,59,61,62,65,67,69,71,73,74,77,79,
 82,83,85,86,87,89,91,93,94,95,97,101,103,106]